#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>

#define BUF_SIZE 30

void error_handling(char *message);

#define PORT "8889"

int main(int argc, char *argv[]) {
    int sock;
    char message[BUF_SIZE];
    int str_len;
    socklen_t adr_sz;

    struct sockaddr_in serv_adr, from_adr;
//    if (argc != 3) {
//        printf("Usage : %s <IP> <port>\n", argv[0]);
//        exit(1);
//    }

    sock = socket(PF_INET, SOCK_DGRAM, 0);
    if (sock == -1)
        error_handling("socket() error");

    memset(&serv_adr, 0, sizeof(serv_adr));
    serv_adr.sin_family = AF_INET;
    serv_adr.sin_addr.s_addr = inet_addr("127.0.0.1");
    serv_adr.sin_port = htons(atoi("8888"));

    while (1) {
        fputs("Insert message(q to quit): ", stdout);
        fgets(message, sizeof(message), stdin);
        if (!strcmp(message, "q\n") || !strcmp(message, "Q\n"))
            break;

        sendto(sock, message, strlen(message), 0,
               (struct sockaddr *) &serv_adr, sizeof(serv_adr));
        adr_sz = sizeof(from_adr);
        str_len = recvfrom(sock, message, 2, 0,
                           (struct sockaddr *) &from_adr, &adr_sz);

        message[str_len] = 0;
        printf("Message from server: %s\n", message);
    }
    close(sock);
    return 0;
}

void error_handling(char *message) {
    fputs(message, stderr);
    fputc('\n', stderr);
    exit(1);
}